How can i protect myself without harming her?

Hello sir/maam I am from Jabalpur, M.P and I got married with a girl (from Ambala, Haryana) in arya samaj mandir with all hindu rituals in jabalpur in 2019. we did marriage from mutual consent and no issue were there. recently i got to know that the girl was married and had a child also. when i tried to know all things , i got to know that many years ago, her family had meeting in gram panchayat and her husband asked that time, that he did not want to live together he had no issue if she tried to get married anywhere. and it was mutual consent among both families and panchayat because girl was facing physical torture and other voilence for many years. but recently her husband found us anywhere, and he wants to torture out of no reason her and show people that he wants her again in life and taking benefit of no legel divorce. the girl has favoured me that i was not knowing anything about her past life and child. i was innocent and unknown to any matter, in front of police and all. and accepted that it was her fault. and told that she had been assuming for so long that no issue would be created in her future life and so she had been hiding all the things and was trying to start a new life. Now she is ready to support me sothat no one can harm me anyhow. she told that her divorse was not done on the legel basis only on panchayat basis. Now her husband is harming me and my family, spreading rumours at my hometown out of no reason even if she clearly told all the things to everyone. I am not doing anything legel because i dont want to get involved in all these , and worried about my life and career. what to do i dont know? and dont want to have further relation with that girl. but dont want to go against the girl also bcoz she supported and spoke the truth among all, which i had not expected at all in such cases from a girl. she is ready for anything in my favour bcoz only she knows the truth for which she is feeling guilty. actually we got married secretly no one was knowing our marriage. now we told the people that we were living in live-in-relationship. Now her hubby is trying to collect the evidence of marriage to go against we both. How can i hide my marriage or cancel it secretly. i visited Arya Samaaj Mandir also they people asked for huge amount of money to cancel it. i do not have so much money. how can he reach to know about our marriage or what can we do? How can i protect myself in future?